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Yes, by quite a bit. Right now the heaviest object soft landed on Mars is Curiosity, as you noted. The mass of it is 900 kg. The Red Dragon is 6400 kg, plus payload of up to 2000 kg (Maybe more for later flights)

In fact, when successful, the Dragon will be more than the sum of every other object which attempted to soft landed on Mars. Each Viking massed 600 kg, Curiosity 900, Phoenix 350, Spirit and Opportunity each 530 kg (For the package that landed on the surface, the rovers are much less), Pathfinder/Sojourner 280, Mars 2, 3, and 6 about 360 kg each, Mars Polar Landar was 290 kg, and Beagle 2 35 kg. Total is about 5300 kg, under the mass of the Red Dragon alone.

$\begingroup$You're list is missing two failed landers. The Mars Polar Lander (290kg, Phoenix's predecessor), and Beagle 2 (29kg, a small lander that was sent as part of the ESAs 2003 mission). Their total mass isn't enough to change your final conclusion.$\endgroup$
– Dan NeelyMay 13 '16 at 2:55